[9fans] lp bind strangeness

[steve.simon@snellwilcox.com]

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Hi,

I cannot work out what is going on.

I have been using lp to print via a remote BSD printer for months.

I have added a /lib/namespace (attached) but I cannot see how
this harms anything.

NB. my /usr/local/sys/lib/lp/spooler only contains the binaries for forsyth's
smb print client.

Now when I try to print I get:
	lpdspool: '/bin/rc' directory entry not found
On closer inspection the following code from /rc/bin/lp is being run:

if (~ $RESET '') {
	switch ($SPOOLER) {
	case -;	echo spooler does not exist for $LPDEST >[1=2]
		exit 'no spooler'
	case *;	bind -b $LPLIB/spooler /bin
		if (~ $#* 0) $SPOOLER
		if not $SPOOLER $*
	}
}

it seems that the bind is causing /386/bin/rc to disapear from /bin.

I cannot see how this can be possible. If I change the bind -b to a bind -a
then it works as expected.

It cannot be any of my mounts as lp rebuilds /bin's mounts itself
and I have nothing mounted over /386/bin or /rc/bin for that matter.

I thought I understood union directories - obviously not :-(

-Steve

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bind -b /usr/local/386/bin /bin
bind -a /386/bin/ip /bin/ip
bind -a /386/bin/upas /bin/upas

bind -b /usr/local/rc/bin /bin
bind -a /rc/bin/service /bin/service

bind -b /usr/local/acme/bin/386 /acme/bin/386

bind -a /usr/local/386/lib /386/lib
bind -a /usr/local/386/include /386/include
bind -a /usr/local/sys/include /sys/include

bind -a /usr/local/sys/doc /sys/doc

bind -a /usr/local/sys/man/1 /sys/man/1

bind -a /usr/local/sys/lib/lp/spooler /sys/lib/lp/spooler

bind -a /usr/local/lib/font/bit/pelm /lib/font/bit/pelm
bind -a /usr/local/lib/font/bit/lucida /lib/font/bit/lucida

bind -a /usr/local/sys/lib /sys/lib

bind -c /usr/local/lib/face/48x48x4/.dict /lib/face/48x48x4/.dict
bind -a /usr/local/lib/face/48x48x4 /lib/face/48x48x4

bind -b /usr/local/mail/lib /mail/lib

bind -bc /usr/local/sys/src/9/pc /sys/src/9/pc
bind -bc /usr/local/sys/src/9/boot /sys/src/9/boot